There is a lot of research into the idea of a "space elevator". The idea that if you attached a string from something in geosynchronous orbit and dropped it down to earth, the string would essentially float in air.

However, Earth's geosynchronous orbit is at 42164 km (26199 mi).

The weight of a 26,000 mile cable exceeds the tensile strength of all materials known to man, except perhaps the Carbon Nanotube, which, unfortunately, has only been produced a few mm long. And, short-fiber carbon nanotube yarn lacks the strength we need.

Building a 26,000 mile tall building would also be a monstrous undertaking.

However, at 26,000 miles, it would only get it into Earth's orbit, which is already getting "cluttered". One would really need to put it somewhere like on the moon 384,403 km (238,857 miles).

The volume of water in the oceans is tremendous.There are about 139.5 million square miles of ocean.

The top foot of ocean would be: 139.5 million square miles x 1 foot = 139,500,000 / 5280 feet/mile = 26420 cubic miles of waterThat is a LOT of shuttle missions.